« previous next »

Author Question: Each entity type in an ER Diagram becomes an attribute. Indicate whether the statement is true or ... (Read 63 times)

Evvie72

  • Hero Member
  • *****
  • Posts: 519
on: Jul 7, 2018
Each entity type in an ER Diagram becomes an attribute.
 
  Indicate whether the statement is true or false

Question 2

Referential integrity specifies that the value of an attribute of one relation depends on the existence of the same attribute in another relation.
 
  Indicate whether the statement is true or false


fromAlphatoOmega22

  • Sr. Member
  • ****
  • Posts: 345
Reply #1 on: Jul 7, 2018
Answer to Question 1

FALSE
Explanation: Each entity type in an ER Diagram becomes a relation, not an attribute.
CL

Answer to Question 2

TRUE
Explanation: For instance, you can't have StudentID in STUDENT_CLASS unless StudentID already exists in STUDENT.
CL


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

About 60% of newborn infants in the United States are jaundiced; that is, they look yellow. Kernicterus is a form of brain damage caused by excessive jaundice. When babies begin to be affected by excessive jaundice and begin to have brain damage, they become excessively lethargic.

Did you know?

A serious new warning has been established for pregnant women against taking ACE inhibitors during pregnancy. In the study, the risk of major birth defects in children whose mothers took ACE inhibitors during the first trimester was nearly three times higher than in children whose mothers didn't take ACE inhibitors. Physicians can prescribe alternative medications for pregnant women who have symptoms of high blood pressure.

Did you know?

According to research, pregnant women tend to eat more if carrying a baby boy. Male fetuses may secrete a chemical that stimulates their mothers to step up her energy intake.

Did you know?

Eating food that has been cooked with poppy seeds may cause you to fail a drug screening test, because the seeds contain enough opiate alkaloids to register as a positive.

Did you know?

There are major differences in the metabolism of morphine and the illegal drug heroin. Morphine mostly produces its CNS effects through m-receptors, and at k- and d-receptors. Heroin has a slight affinity for opiate receptors. Most of its actions are due to metabolism to active metabolites (6-acetylmorphine, morphine, and morphine-6-glucuronide).

Diagram of an endomembrane system Diagram of an endomembrane system
Peripheral nervous system PNS Diagram Peripheral nervous system PNS Diagram
False-color imagery of the Sun, a G-type main-sequence star, the closest to Earth. False-color imagery of the Sun, a G-type main-sequence star, the closest to Earth.
Adapoids and omomyoids had longer snouts and are the first “true” primates. Adapoids and omomyoids had longer snouts and are the first “true” primates.
Schematic Diagram of Agitation Apparatus and other equipment (CHE415 Unit Operations) Schematic Diagram of Agitation Apparatus and other equipment (CHE415 Unit Operations)
Schematic diagram of virulence factors of Helicobacter pylori. Schematic diagram of virulence factors of Helicobacter pylori.
Video: Griffith's experiments

For a complete list of videos, visit our video library